Any decent fingerprint scanner app?

Does anyone knows if there are any app that can utilize the fingerprint scanner? I tried to search but only get all those "fake" scanner apps which just a prank to "emulate" the screen as a scanner.

It would be wonderful to be able to launch certain app via scan a finger "anytime when screen on!" (not only during unlock stage like now") or switch to previous activited app just by swiping of a finger...

I think the location of the scanner is perfect for those jobs.... Personally I would pay $10 for a app like I mentioned...

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